He racked his camera and pressed down the shutter release.

他将照相机的焦距调好,然后按下快门.

Use the self-timer or a remote shutter release to minimise camera shake.

使用自拍模式或者线控快门，以减少相机振动的影响。

Use the self - timer or a remote shutter release to minimise camera shake.

使用自拍模式或者线控快门,以减少相机振动的影响.